期刊
SMALL
卷 12, 期 7, 页码 911-920出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201502905
关键词
chemiresistive sensors; nanofibers; polystyrene colloids; protein-encapsulated catalysts; self-assembly
类别
资金
- Center for Integrated Smart Sensors - Ministry of Science, ICT & Future Planning as Global Frontier Project [CISS-2011-0031870]
- MRSEC Program of the National Science Foundation [DMR - 1419807]
- Intel's University Research Office (URO)
- Korea Evaluation Institute of Industrial Technology (KEIT) [10070075] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2011-0031870, 2016H1A2A1907718] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A novel catalyst functionalization method, based on protein-encapsulated metallic nanoparticles (NPs) and their self-assembly on polystyrene (PS) colloid templates, is used to form catalyst-loaded porous WO3 nanofibers (NFs). The metallic NPs, composed of Au, Pd, or Pt, are encapsulated within a protein cage, i.e., apoferritin, to form unagglomerated monodispersed particles with diameters of less than 5 nm. The catalytic NPs maintain their nanoscale size, even following high-temperature heat-treatment during synthesis, which is attributed to the discrete self-assembly of NPs on PS colloid templates. In addition, the PS templates generate open pores on the electrospun WO3 NFs, facilitating gas molecule transport into the sensing layers and promoting active surface reactions. As a result, the Au and Pd NP-loaded porous WO3 NFs show superior sensitivity toward hydrogen sulfide, as evidenced by responses (R-air/R-gas) of 11.1 and 43.5 at 350 degrees C, respectively. These responses represent 1.8- and 7.1-fold improvements compared to that of dense WO3 NFs (R-air/R-gas = 6.1). Moreover, Pt NP-loaded porous WO3 NFs exhibit high acetone sensitivity with response of 28.9. These results demonstrate a novel catalyst loading method, in which small NPs are well-dispersed within the pores of WO3 NFs, that is applicable to high sensitivity breath sensors.
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